JPH0452512Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a speed change control device for a toroidal continuously variable transmission.

(Prior art) A toroidal type continuously variable transmission has a toroidal transmission unit between input and output shafts, which consists of an input/output cone disk and a plurality of power rollers that transmit power through frictional engagement between these cone disks. It is common to have When changing speeds, the plurality of power rollers are oscillated so that the diameters of the power roller contact loci of both cone disks change, thereby performing continuously variable speeds.

Incidentally, although the power roller maintains its rotational position (selected gear ratio) around the oscillation axis at the neutral position where the rotation axis intersects with the rotation axis of the input/output cone disc, if it is offset in the direction of the oscillation axis from this neutral position, , receives the swinging force from the cone disc according to the offset direction, and swings itself.

Based on this, a speed change control device for a toroidal type continuously variable transmission is disclosed in Japanese Patent Application Laid-Open No. 59-155656, and as schematically shown in FIG. Usually, the roller 3 is configured to be offset-controlled from a neutral position where the rotation axis 3a intersects the cone disk rotation axis I in the direction of the power roller oscillation axis 3b by hydraulic pistons 4 to 7 to perform continuously variable speed. In other words, when it is desired to shift the gear ratio to the high speed side, the pressure P _A applied to the hydraulic pistons 5 and 6 is increased, and the pressure P _B applied to the hydraulic pistons 4 and 7 is decreased to offset the power roller 3 in the direction of the arrow U, respectively. However, when you want to shift the gear ratio to the lower speed side, apply pressure
By lowering P _A and increasing pressure P _B , the power rollers 3 are offset in the direction of arrow D, respectively.

On the other hand, if a difference occurs in the swing angle between the power rollers 3 due to disturbance or the like, the amount of slip of the power roller 3 relative to the cone disks 1 and 2 is changed. Incidentally, the change characteristics of the traction coefficient (traction force) with respect to the slip amount (commonly called the creep amount) are as shown in FIG. 7, and are classified into a linear region, a non-linear region, and a thermal region. The power roller that deviates from the balance value B toward the higher gear ratio side has a larger amount of creep, and the power roller that has shifted toward the lower gear ratio side has a smaller amount of creep, so the former power roller increases the traction force as shown at point H. The traction force of the latter power roller is reduced as shown at point L.

Since the pressures P _A and P _B are maintained at values corresponding to the balance value B, the power roller shifted toward the high gear ratio side is displaced in the downshift D direction, and the power roller shifted toward the low gear ratio side is displaced. is displaced in the upshift U direction, and returns to balance value B as a result.

By the way, if the power roller oscillation angle has a large deviation due to disturbances, etc., and the power roller that has deviated to the high gear ratio side enters the heat range shown in Fig. 7, it will lose the self-returning ability described above and will not be able to return to the balance value B. . In order to prevent such a situation from occurring,
As shown in Japanese Patent No. 69356, a technique has been proposed in which each power roller is driven and connected to each other by a wire in the oscillating rotation direction so as to be interlocked in the same speed change direction.

(Problem that the invention aims to solve) On the other hand, depending on the transmission capacity requirements, toroidal type continuously variable transmissions are equipped with multiple sets of toroidal transmission units instead of just one set, and these toroidal transmission units allow transmission between common input and output shafts. There arises a need for a configuration that allows parallel power transmission.

In this case, for example, as shown in FIG. 8, the first toroidal transmission unit 10 and the second toroidal transmission unit 20 are arranged coaxially on a common axis I, and the output cone discs 12 and 22 are arranged back to back. The input cone discs 11 and 21 are connected to the shaft 30
The output cone disks 12 and 22 are rotatably supported on this shaft, and these output cone disks are drivingly connected by a spline 31.

An input shaft 32 is coupled to the input cone disk 11, and an output gear 33 is provided coaxially between the output cone disks 12 and 22. This output gear is transferred to the output cone disc 12 by the loading cam 34.
The loading cam 34 is coupled to the output cone disc 1 by thrust according to the transmitted torque.
2 and 22 are biased toward the input cone disks 11 and 21, respectively.

Due to this bias, the power rollers 13 and 23, which are pressed between the cone disks 11 and 12 and between the cone disks 21 and 22, have their respective axes 13a and 23a.
Each trunnion 18, 28 is attached to the trunnion 18, 28 so as to be rotatable around the oscillating axis 13b, 23b of the corresponding power roller 13, 23.
It can be rotated freely around it.

The power that the input shaft 32 reaches the input cone disks 11, 21 is transferred to the axis 13 of the power rollers 13, 23.
a, 23a to the output cone disks 12, 22 through rotation, and then the loading cam 34.
It can be taken out from the output gear 33 through.

Here, when the power rollers 13 and 23 are synchronously rotated in the direction of the arrow a around the swing axes 13b and 23b at the same speed using the speed change control device shown in Japanese Patent Application Laid-open No. 59-155656, Both units 1
The gear ratios of 0 and 10 are synchronized and shifted to the high speed side at the same speed, and the transmission can be continuously variable toward a higher gear ratio. When the power rollers 13 and 23 are oscillated and rotated in the opposite arrow b direction at the same speed, the gear ratios of both units 10 and 20 are synchronized and shifted to the low speed side at the same speed, and the transmission is shifted to the low speed side. It is possible to continuously change the gear ratio.

By the way, if the power roller oscillation synchronization technology of the above-mentioned Japanese Patent Application Laid-Open No. 57-79356 is applied to a continuously variable transmission equipped with a plurality of toroidal transmission units, as shown in FIG. 32 and 36, wire 35 is placed between the trunnions 18, and wire 36 is placed between the trunnions 28.
Each trunnion and wire are connected by pins 19 and 29, with each trunnion being crossed in between.

However, even if it is possible to synchronize the oscillations between the power rollers for each toroidal transmission unit, it is not possible to synchronize the oscillations of the power rollers between the toroidal transmission units, and a large loss of synchronization may occur due to external disturbances. The occurrence of a situation in which this occurs cannot be prevented.

(Means for Solving the Problems) In view of the above-mentioned problems, the present invention is designed to interlock all the power rollers in the same speed change direction so that the power roller swings can be synchronized even between the toroidal transmission units. It is provided with means for driving and connecting in the direction of swing rotation.

(Function) Multiple sets of toroidal transmission units transmit power in parallel between common input and output shafts, and during this power transmission, all power rollers are oscillated in synchronization at the same speed and in the same shift direction. , it is possible to perform continuously variable transmission.

Here, when the power roller is about to change its oscillation angle due to disturbance, the means attempts to oscillate the other power rollers in conjunction with the same speed change direction, and the oscillation angle of the power roller Limit angular deviation. Therefore, the deviation in the swing angle of the power roller can be kept within a linear range, and the power roller can be returned to the balanced value by the self-returning ability.

(Example) Hereinafter, the present invention will be explained in detail based on the illustrated example.

FIG. 1 shows an embodiment of the speed change control device of the present invention applied to the toroidal continuously variable transmission shown in FIG. 8. In this example, another wire 37 is added in addition to the wires 35 and 36 shown in FIG. , this wire is crossed over the adjacent trunnions 18, 28 between the toroidal transmission units 10, 20 (see FIG. 8). Note that the wire 37 is attached to the pins 19 and 2 together with the wires 35 and 36.
9 connects to corresponding trunnions 18 and 28.

In such a configuration, when a certain power roller is about to change its swing angle around its own swing axis 13b, 23b due to a disturbance, the wires 35 to
37 is for moving other power rollers in the same speed change direction a or b.
The swing angle of the certain power roller is limited. Therefore, the deviation in the swing angle of the power roller can be kept within the linear range shown in FIG. 7, and the power roller can be returned to its balanced value by the self-returning ability.

In addition, in order to obtain the above-mentioned effects, it is necessary to make a
A main wire 38 may be provided and wrapped around each trunnion as shown, or a third
In addition to crossing the wires 35 as shown in FIG. 9, wires 39 and 40 may be placed between the trunnions in the diagonal direction.

In addition, when connecting the power rollers in the oscillation rotation direction between the toroidal transmission units,
As shown in FIG. 4, the trunnions in the diagonal direction may be connected with a tie rod 41 with some play.

Furthermore, in order to drive and connect the power rollers in the oscillating rotation direction for each toroidal transmission unit, gears that mesh with each other with backlash are used between the corresponding trunnions 18 and 28, respectively, as shown in FIG. The sets 42 and 43 may be used for driving connection.

(Effect of the invention) As described above, the speed change control device of the present invention is configured to synchronize the swinging of the power rollers even between the toroidal transmission units, so that in a continuously variable transmission equipped with a plurality of toroidal transmission units, certain It is possible to prevent the power roller of a toroidal transmission unit from causing a large swing angle deviation with respect to the power rollers of other toroidal transmission units, and the power roller with a deviation in swing angle can be returned to a balanced value by its self-returning ability. It is possible to return it.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the speed change control device of the present invention, FIGS. 2 to 5 are plan views similar to FIG. 1 showing other examples of the present invention, and FIG. A schematic diagram of a toroidal type continuously variable transmission. Figure 7 is a characteristic diagram of the change in traction coefficient with respect to the creep amount of the power roller. Figure 8 is a diagram showing the change in the traction coefficient with respect to the creep amount of the power roller.
A half-cutaway plan view of the toroidal type continuously variable transmission to be assembled, and FIG. 9 is a plan view similar to FIGS. It is. 10...first toroidal transmission unit, 20...
...Second toroidal transmission unit, 11, 21...
Input cone disk, 12, 22... Output cone disk, 13, 23... Power roller, 13
a, 23a...power roller rotation axis, 13b,
23b...Power roller swing axis, 18, 28
... Trunnion, 19, 29 ... Wire locking pin, 30 ... Shaft, 32 ... Input shaft, 33 ... Output gear, 34 ... Loading cam, 35-40 ...
...Wire, 41...Tie rod, 42, 43...
gear set.

Claims (1)

[Claim for Utility Model Registration] Consisting of an input/output cone disk and a plurality of power rollers that transmit power through frictional engagement between these cone disks, these power rollers are In a toroidal continuously variable transmission, each of the power rollers is equipped with a plurality of sets of toroidal transmission units whose heads are oscillated to change gears so as to enable parallel transmission between common input and output shafts. 1. A speed change control device for a toroidal continuously variable transmission, characterized in that a means is provided for drivingly connecting the two in the oscillation rotation direction so as to interlock with each other in the same speed change direction.